Luminous Landscapes incisive review on the Sigma SD1 offers interesting thoughts on what gives Foveon images that extra little sparkle that seems to set them apart from others. This is one of the few, if any, independant reviews I have read that acknowledges there is something dimensional about their presentation. The reviewer believes it to be in the micro-detail that the sensor is able to capture without the anti-aliasing filter. Since there is no danger of moire in a foveon sensor, the filter is not needed, hence extra fine detail is captured. I have also noticed this quality with a few other manufacturers, notably Olympus who reportedly use a weaker filter than most, and also the higher end Canon models which produce images with a tack like sharpness that makes me wonder if they are also following this route. Ultimately, it leads me to speculate that it would be an interesting option for a manufacturer to offer a removable filter or leave it off altogether. I know there are third party companies out their offering this service, but as a factory option it would be something I would personally consider when looking at a purchase.